Synthesis of novel magnetic chitosan supported protonated peroxotungstate and its catalytic performance for oxidation

Abstract

A novel magnetically recoverable catalyst in which protonated peroxotungstate was immobilized into a network of cross-linked chitosan with a superparamagnetic Fe₃O₄ core (Fe₃O₄–CS/HWO) was prepared, characterized and used in oxidation reactions. With H₂O₂ as oxidant, a wide range of substrates including olefins, sulfides, amines and allylic alcohols could be oxidized selectively, exhibiting a relatively high utilization percentage of H₂O₂. Due to the existence of peroxotungstate as well as the magnetic core, both improved catalytic performance and facilitated separation were achieved for the reaction process.